Watch timer



July 18, 1933. G. D. GUSTAFSON WATCH TIMER Filed Feb. 1, 1932 mum vpivotedto a bell crank 28. The bell crank 28 ative time intervals of twotime pieces.

movement of the time indicator; to provide Patented July 18, 1933 UNITEDSTATES eu man D. eus'mrson, or CHICAGO, ILLINOIS WATCH TIMER IApplication filed February 1, 1932. Serial No. 590,190.

This invention relates to an improved method of obtaining an indicationof the rel The main obj ectof my invention is to provide an indicatoror-recorder which indicates rapidly the time interval of a watch as comepared with a master or standard; and further to provide an electricallyoperated pointer which by its movement shows unison or lack of unison intime pieces; to provide an electrically operated mechanical movementcontrolled by sound or tick from a time piece; to provide microphones orthe like, excited by time pieces, tocontrol the mechanical an indicatorarranged to show the resultant of two motions in time relation; and toprovide a stylus on the indicating needle which makes a record on achronograph.

An illustrative embodiment of my 1nvention is shown in the accompanyingdrawing in which I Figure 1 is a diagrammatic drawing of the completeapparatus.-

For illustrative purposes a master time piece 1 is shown adjacentthemicrophone 2. In circuit with the microphone 2 is an electromagnet 3 anda battery 4, connected to form a closed circuit by leads 5, 6 and 7. Anarmature 8 placed in the field of the electromagnet swings on a pivot 9,and is connected by pivot 10 to a link 11, which slides in a looselyfitting guide 12. The link 11 is pivoted at 13 to one leg of abifurcatedneedle or pomter 15. At

F the upper end of the needle is a stylus 16 which bears on a roll ofpaper 17, driven by a clock movement in the case 18. The other leg 19 ofthe bifurcated needle is connected tojthe armature 20 by a link 21.

A second electromagnet 22 is in circuit with 1 a battery 23, and amicrophone 24, which is in van working range of the watch 25. Qn theneedle 15 is fastened a lug 26 positioned to engage a one-way gravitylatch '27, which is is arranged to close an electric circuit comprisinga terminal 29, a source of E. M. F. 80, a lead 31, anincandescent lamp32, and a lead 33, completing the circuit-to the bell crank.

The gravity latch'27 is located'to coact with .a lug 26 when the needle15 is moved to the left of its zero position, and the circuit throughthe lamp 32 is only closed when the lug 26 is traveling upwards.

In operation thcsound waves from the tick of the time piece control thepulsations of current whichfiow from the batterythrough the microphoneand the electromagnet. Assume that the master time piece is in sound.

control of its microphone, putting only one armature in motion. Then thestylus on the needle will describe an are substantially at right anglesto the motion of the link. The motion is that of a bell crank.

master removed from control, then the stylus will describe the same areat right angles to direction of motion.

The most important motion is that which is obtained when both the masterand the watch under test are in unison and in phase. Then the needlewill travel straight up and down. In actual practice the master clockthrough its time control is adjustable until the two time pieces are inexact phase, which is indicated when the needle travels'straight up anddown, with .no side motion. The maximum side motionis produced when thetime pieces are out of phase.

In all phase relations the resultant described will vary from an ellipseto a circle. One 'of the main features of my time arrangement is thatthe direction ofrotation ofthe stylus, right-handed. or left-handed,

depends on whether the watch under test is faster or slower than themaster. A visible indication of the direction of rotation is obtained byproviding the needle with a lug which has a free movement, up and down,

lamp does not light, the operator knows the In case the watch to betested is placed in 55 working range of its microphone, with the i whenthe master and the watch under test are in unison.

. a A complete graphical record of the relative time intervals isrecorded on themoving paper on the chronograph by thest lus.

The graphic record is capable of an ana sis similar to that froman-indicator card ta en 19 from an engine V 1 Although but one specificembodiment of this invention has been herein shown and described, itwill be understood that certain details of the construction shown maybea1,

tered or omitted without departin from the spirit of this invention asdefined y the following claims. 7

' I claim:v I

.1. A devicefor detecting theidifl'erence go in rates of vibration ofseparate sounds consisting of independent sound responsive elements, alever connected, for vibration with ,each of sald sound responslveelements, and a: recording means connected w1th one of iglus is rotatingleft-handed; The

said 'leversfor movement in one direction,

and with another of said levers for movement in another direction.

2. A means for recording the difference in rates. of vibration-fromseparate sources of sound comprising, a recording memberhav- --ing twopivotal supports, each of said su'p' portsbeing movable, soundresponsive means 1 orfimparting movementto one, ofsaid suports andseparate soundfrespons'ive means or imparting movement to the otherofisaid supports.

, 3. Recording means of the class described,

{comprising a vibratable. needle, 9. pair of ec centrically spaceddpivotal supportsfor said needle, each of sai supports being movablymounted, electro-magnetic means ing each of said supports, a pair'ofmicrophones, and circuit connections for said microphones whereb eachmicrophone may control the operation. of one of the-electromagnetic'means for vibrating a pivotal sup-- port'ior the needle.

" GUNNAR 111 GUSTAFSON. I

or vibrat-

